app/views/layouts/_header.html.erb
<nav class='navbar navbar-default'>
<div class='container'>
<div class='navbar-header'>
<button type='button' class='navbar-toggle collapsed' data-toggle='collapse' data-target='#bs-nav' aria-expanded='false'>
<span class='sr-only'>Toggle navigation</span>
<span class='icon-bar'></span>
<span class='icon-bar'></span>
<span class='icon-bar'></span>
</button>
<%= link_to 'Git Reports', root_path, class: 'navbar-brand' %>
</div>
<div class='collapse navbar-collapse' id='bs-nav'>
<ul class='nav navbar-nav navbar-right'>
<% if signed_in? %>
<li class='dropdown'>
<%= link_to profile_path, class: 'dropdown-toggle', data: { toggle: 'dropdown' }, role: 'button', aria: { haspopup: 'true', expanded: 'false' } do %>
<%= current_user.username %> <span class='caret'></span>
<% end %>
<ul class='dropdown-menu nav-menu'>
<li><%= link_to 'Profile', profile_path %></li>
<li><%= link_to 'Logout', logout_path %></li>
</ul>
</li>
<% else %>
<li>
<%= link_to 'Login', login_path %>
</li>
<% end %>
</ul>
</div>
</div>
</nav>